Peters



JOHN GREENWOOD, OF` .ROCHE-STEP,` NEW` YORK.

Letters Patent No. 79,651, dated July 1868.

' IMPROYEMBNT IN MAGHINES POR CUTTING STAVES.

@La 5tlget11-lenfttrttit in tips itettets nttnt mit mating part nf tige sat-ze.

TO ALL WHOM IT MAY CON CERN:

iribs, a a, against which the bolt moves as it is carried up on the swinging bed B, to the cutter C.

Be it known that I, JOHN GREENWOOD, of Rochester, in the county 'of Monroe, and State of- New York, have invented a certain new and useful Improvement in Machines for Cutting Staves; and I do hereby declare that the following is a full and exact description thereot`reference being had to the accompanying drawings,v

making part of .fhisvspecificatiom Figure 1 is a vertical cross-section of the machine.

'Figure 2,-a diagram, showing the arrangement of the rollers and springs.

Like letters of reference indicate corresponding parts in both ligures.

Myinvention consists in the combination and arrangement of a double set of rollers with the cnrv'ed ribs, in such'a manner as to sustain thestave-bolt without coming'in contactrwith the ribs themselves, leaving thereby a narrow space between the said bolt and the ribs, to allow chips and splinters to pass through without displacing the bolt; also, in the employment of springs, combined with the above,for preventing the st'aves from dropping back into the machine after being cut from the bolt.

In the drawings, A represents the frame, which is of the usual form, having on the backa series of curved` `In the face of each of the curved ribs a a, `I employ a double set of rollers, g g, 7L h, situated alternately l-m opposite sides, so as to break joints witheach other, and setting out a little distance from the ribs, soas to "leave a narrow space between the bolt, that rests against the rollers, and the ribs.

-v ,'One great diiculty in cutting staves in ordinary machines, where no rollers are employed,is caused by the Atfhips and splintersfalling on the ribs, thereby throwing the bolt out of position, as it slides over them in moving to thecutte'r, thus producing an irregular and imperfect out of the stave. Another diiieulty is, that the Yspliters become wedged between the edge of the swinging bed and face of the ribs,'and obstruct the easy operation of the machine, and render it liable to breakage; and furthermore, the friction of the stave-bolt against the ironribs streaks and discolors the staves, which rcndersthei'n unfit for tinework. This is especially the vcase with oak staves, the sap of which seems to produce a chemical Aetect in contact with the i'ro'n, which stains the wood.

With the use of the double set of rollers, arranged alternately, as above described, so as to leave a narrowspace between the bolt and ribs, chips and splinters will fall down in the spaces, and easily work out between the rollers, and drop o5' without interfering with the bolt, and without obstructing the operation ofthe swinging bed. This alternate arrangement of the rollers also provides a uniform and continuons bearing or rolling- `surface for the holt in moving up to the cutter, and. at the. same time preserves the face ofthe ribs, and prevents 'streaking and discoloring of the wood. i v

A set of two or more springs, k r, arranged at suitable distances apart, are employed, for the purpose of holding thestave as it is cutA from the bolt,` and preventing it from falling back wh'en thev bolt is lowered.

As the bolt passes up to b'e cut, the edge ot' the stave, striking the end of the springs lc k, forces them back until the stave is cut clear, when the springs, holding its lower edge, prevent it from falling back.-

At the inner edge of the swing-bed, I secure a strip of metal, e, leaving a groove, z', which fills with wood, dust, and fine 4splinters; for; the edge of -the cutter C to strike into, and preventy it.from dulling, and also to allow the staves to cut clear of the bolt. i

I am aware that friction-rollers have been in use for various purposes, and therefore do not claim them broadly.

What I'claiiil as my invention, and desire to secure by Letters latent, is

The alternate arrangement, on the face of ribs a a, of the double set of rollers g t, operating relatively with the swing-bed B and cutter'C, substantially as and for the purpose described.

In witness whereof, I have' hereunto signed my name in the presence of two subscribing witnesses.

JOHN GREENWOOD.

Witnesses:

J. A. DAvIs, W. J. CRnELMAN. 

